For electrochemical sensors, the electroactive surface area (ESA) show higher value for the working material as compared to bare (reported in several papers). My bare electrode is FTO and working material which gave good oxidation currents is an oxide. However, I got low ESA value for oxide over bare. what are the reasons for this behavior? Is their any relation for high oxidation/reduction currents and ESA?
Dear Gudipati Neeraja Sinha ;
For your information, (FTO) glass is fluorine-doped tin oxide coated glass. It is electrically conductive and ideal for use in a wide range of devices.
The effective electrochemical accessible area are those which are accessible to electrochemical reaction. If the roughness features or pore size in deposited materials are smaller than that of diffusion length, that particular area will be mask by the supporting electrolyte and contribute to the non faradaic process (electric double layer contribution). This can be confirmed by recording the CV in the supporting electrolyte at bare and desopited electrodes.
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